1.

5. The focal length of a concave mirror is 30 cm. If the object is at 20 cm. Determine the position andnature of object.

Answer»

For concave mirror

u= -20 cm

f= -30 cm

By using mirror formula,

1/v + 1/u = 1/f

1/v + 1/-20 = 1/-30

v= 60 cm

Positive sign indicates that image is in opposite side of mirror

Therefore,

The distance between image and object = 60+20 = 80 cm



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